4 mol of a mixture containing one mol each of `LiNO_(3), NaNO_(3), Ca(NO_(3))_(2), Ca(NO_(3))_(2)` and `Mg(NO_(3))_(2)` is decomposed by strongly heating. The total number of moles o `NO_(2)(g)` evolved is (assuming complete decomposition of all the salts)

Answer

5

Explanation

`2LiNO_(3)overset(Delta)(to)Li_(2)O+2NO_(2)+1/2O_(2)`
`1` mol of `LiNO_(3)` will produce `NO_(2)=1`
`2Mg(NO_(3))_(2)overset(Delta)(to)2MgO+4NO_(2)+O_(2)`
1 mol of `Mg(NO_(3))_(2)` will produce `NO_(2)=2`
`2Ca(NO_(3))_(2) overset(Delta)(to)2CaO+4NO_(2)+O_(2)`
1 mol of `Ca(NO_(3))_(2)` will produce `NO_(2)=2`
`2NaNO_(3)overset(Delta)(to)2NaNO_(2)+O_(2)`
Total number of moles of `NO_(2)` produced `=5`